CN112621021A - H0Cr19Ni24Mn7Mo6VN welding wire and preparation method thereof - Google Patents
H0Cr19Ni24Mn7Mo6VN welding wire and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention provides an H0Cr19Ni24Mn7Mo6VN welding wire and a preparation method thereof, wherein the welding wire comprises the following elements: 0.05 to 0.075 percent of C, 0.45 to 0.6 percent of Si, 6.2 to 7.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 18.5 to 19.5 percent of Cr, 23.0 to 24.0 percent of Ni, 6.0 to 6.5 percent of Mo, 0.75 to 0.85 percent of V, 0.11 to 0.16 percent of N, less than or equal to 0.03 percent of Ti, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Al, less than or equal to 0.005As, less than or equal to 0.080 percent of As, and the balance of Fe. The invention strictly controls the element types and contents in the alloy components and optimizes and adjusts the preparation process of the welding wire, so that the prepared welding wire has the comprehensive mechanical properties of high strength, high toughness and high corrosion resistance.
Description
Technical Field
The invention relates to the field of alloys, in particular to an H0Cr19Ni24Mn7Mo6VN welding wire for ocean engineering and a preparation method thereof.
Background
China has abundant marine resources and a vigorously developed marine industry, but the marine environment is very harsh and has strong corrosivity, so that marine corrosion and protection are problems which need to be seriously solved in the economic development of China. The marine environment is a complex corrosive environment, in which seawater itself is a strong corrosive medium, and at the same time, the waves, tides and currents generate low-frequency reciprocating stress and impact on metal members, and marine microorganisms, attached organisms and their metabolites, etc. all generate direct or indirect acceleration effect on the corrosion process.
The marine vessel, marine oil and gas drilling platform, submarine tunnel engineering, submarine pipeline, island reef engineering, seawater desalination, ocean vessel and the like need to use a large amount of steel, and the steel is in the strong corrosive marine atmosphere and seawater for a long time, and the welding part of the steel becomes the most easily corroded and broken place, so the parts require the welding seam to have the following properties by the special working environment of the parts: one is to exceed the strength of the parent metal in terms of strength; secondly, the material has higher impact toughness; and the wear resistance and the corrosion resistance are better.
However, the general welding wire materials on the market at present can not meet the design requirements of ocean engineering components in terms of comprehensive mechanical properties, and can not be matched with the components in terms of high strength, wear resistance and corrosion resistance.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an H0Cr19Ni24Mn7Mo6VN welding wire and a method for preparing the same.
In order to achieve the above purpose, the invention provides an H0Cr19Ni24Mn7Mo6VN welding wire, which comprises the following elements in percentage by weight: 0.05 to 0.075 percent of C, 0.45 to 0.6 percent of Si, 6.2 to 7.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 18.5 to 19.5 percent of Cr, 23.0 to 24.0 percent of Ni, 6.0 to 6.5 percent of Mo, 0.75 to 0.85 percent of V, 0.11 to 0.16 percent of N, less than or equal to 0.03 percent of Ti, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Al, less than or equal to 0.005As, less than or equal to 0.080 percent of As, and the balance of Fe.
Preferably, the mechanical properties of the welding wire satisfy: the tensile strength Rm is 1100-1400 MPa.
The invention also provides a preparation method of the H0Cr19Ni24Mn7Mo6VN welding wire, which comprises the following steps:
(1) preparing materials: preparing materials according to the designed components, and strictly baking all materials according to the system;
(2) vacuum smelting: putting the raw materials into a vacuum furnace for smelting, and performing according to a welding wire smelting process, wherein the vacuum degree in a melting period is less than 8 Pa, the vacuum degree in a refining period is less than or equal to 5Pa, performing high-temperature instantaneous refining at least twice and low-temperature long-time refining at one time, raising the steel temperature to 1560-1580 ℃/1-2 minutes, reducing the steel temperature to 1480 ℃, enabling the refining time to be more than or equal to 25min, enabling the refining temperature to 1560 ℃, not charging argon in the whole process, tapping at 1540 ℃, and casting into 200Kg of electrode bars;
(3) electroslag remelting: carrying out an electroslag remelting process on the electrode bar to obtain an electroslag steel ingot, wherein the slag system executes the existing electroslag process;
(4) forging: red transferring and charging an electroslag steel ingot, forging and heating at 1160-1180 ℃, wherein the heating rate in the heating process is less than or equal to 300 ℃/h, the heat preservation time is more than or equal to 40 minutes, the forging specification is 48mm by 48mm square bars, air cooling is carried out after forging, 100% flaw detection is carried out on the square bars, and the defects are removed by grinding the surfaces;
(5) hot rolling: hot rolling the square rod to form a wire rod with the diameter of 8.0mm, heating to 1170-1200 ℃, preserving heat for 40 minutes, and air cooling;
(6) solution annealing treatment: preheating an electric furnace empty to 750 ℃, charging, keeping the annealing temperature at 1040-1080 ℃, keeping the temperature for 45 minutes, and cooling by water;
(7) drawing: firstly, acid cleaning to check the surface quality, grinding to remove crack defects, and then executing the existing production process to slowly draw the wire rod into filaments;
(8) coiling: the cleaning and drying surface is smooth and free of oil stain, burr, scratch, rust spot, oxide skin, pock mark, crack and dust accumulation, and the cleaning and cleaning layer is wound on the disc.
Preferably, in step (2), in the vacuum furnace, the bottom 1/4 is charged with small pieces of nickel plate, the bottom carbon is dosed at 0.02%, the metal Mo, the metal Cr, NMn, NCrFe, VFe are placed in the middle upper part of the crucible, and the upper part is covered with nickel plate.
Preferably, in the step (2), 0.05 percent of Ni-Mg alloy and 0.3kg of rare earth are added in each vacuum furnace refining, and Al and Ti small materials are added for deoxidation when film formation is stopped after refining, and the components are controlled.
Preferably, in the step (3), the slag system ratio adopted is CaF 2: 65 percent; AL2O 3: 23.5 percent; CaO: 5 percent; MgO: 5 percent; TiO 2: 1.5 percent.
Preferably, in the blending of the step (1), the surface of the steel is returned to the same type, and the blending amount is less than or equal to 10 percent after polishing treatment.
Preferably, in the step (4), the forging is performed after the light forging, and then the heavy forging is performed, and the forging is performed after the furnace is returned to 1180 ℃ and the temperature is kept for 30 min.
Preferably, in the step (2), feeding is carried out at the later stage of pouring, and the mold stripping mark is broken after the pouring is completed for 15 minutes.
Preferably, in the step (2), vacuum smelting is performed to fully degas, and manganese nitride and chromium nitride are added at the later stage.
Compared with the prior art, the welding wire ensures the sufficient strength of the welding line through C, Mn, Ni and Mo, and improves the toughness of the welding line; proper amount of Cu, Cr and Ni alloy elements are used to strengthen the weld seam and increase its corrosion resistance. Proper amount of Ti and B is favorable to inhibiting austenite grain growth in the welding seam, postponing the transformation temperature from austenite to ferrite, promoting the formation of acicular ferrite in the metal grain of the welding seam and refining secondary grains. Proper amount of vanadium with lower cost is introduced, and the vanadium is purified, deteriorated and refined to form grains, so that the alloying of the wear-resistant welding wire is facilitated, and the wear resistance is improved; and proper amount of N can inhibit carbide precipitation, and has favorable influence on sensitized intercrystalline corrosion and toughness of steel. The purity and the comprehensive mechanical property of the welding line are improved by the ultralow S, low P and low N contents.
In addition, the invention adopts a vacuum smelting and electroslag duplex smelting process, and adopts a refining method combining high-temperature instantaneous refining and low-temperature long-time refining in the vacuum smelting process, so that the purity and degassing effect can be further improved, the quality and performance of the electrode rod are improved, the plasticity and impact toughness are enhanced, the yield of processing the forged rod into a thinner welding wire is improved, the optimal deformation temperature is ensured by controlling the forging parameters and the heat treatment temperature, the forging forming is easy, and a proper metallographic structure can be obtained. Therefore, the prepared welding wire has excellent plasticity, toughness and crack resistance.
In other words, the invention strictly controls the element types and contents in the alloy components and optimizes and adjusts the preparation process of the welding wire, so that the prepared welding wire has the comprehensive mechanical properties of high strength, high toughness and high corrosion resistance.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
The invention provides an H0Cr19Ni24Mn7Mo6VN welding wire, which can be named as H0Cr19Ni24Mn7Mo6VN welding wire and can be applied to equipment such as ocean ships, ocean engineering equipment, ships and warships, and the welding wire comprises the following elements in percentage by weight: 0.05 to 0.075 percent of C, 0.45 to 0.6 percent of Si, 6.2 to 7.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 18.5 to 19.5 percent of Cr, 23.0 to 24.0 percent of Ni, 6.0 to 6.5 percent of Mo, 0.75 to 0.85 percent of V, 0.11 to 0.16 percent of N, less than or equal to 0.03 percent of Ti, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Al, 0 to 0.005As and less than or equal to 0.080 percent of Al, and the balance of Fe. And the mechanical properties of the welding wire meet the following requirements: the wire is coiled with the diameter of 1.2mm, the quantity is 1200kg, the tensile strength Rm is 1100-1400MPa, the surface of the welding wire is smooth, and the welding wire has no defects of oil stain, burr, scratch, rust spot, oxide skin, pockmark, crack, dust deposition and the like.
In addition, the invention also provides a preparation method of the H0Cr19Ni24Mn7Mo6VN welding wire, which comprises the following steps:
(1) preparing materials: preparing materials according to the designed components, and strictly baking all materials according to the system; wherein, all metal materials are required to meet the quality standard, and the surface of the same steel grade is returned to be polished and the addition is less than or equal to 10 percent; the blending amount of each element is strictly controlled by the ingredients;
(2) vacuum smelting: putting the raw materials into a vacuum furnace for smelting, and performing according to a welding wire smelting process, wherein the vacuum degree in a melting period is less than 8 Pa, the vacuum degree in a refining period is less than or equal to 5Pa, carrying out high-temperature instantaneous refining at least twice and low-temperature long-time refining at one time, raising the temperature of steel to 1560-1580 ℃/1-2 minutes, reducing the temperature of the steel to 1480 ℃, refining for more than or equal to 25 minutes, refining at 1560 ℃, not charging argon in the whole process, tapping at 1540 ℃, casting into 200Kg of electrode bar, feeding at the later stage of casting, and breaking the blank and taking out of a mold after casting for 15 minutes; wherein, in a vacuum furnace, a small nickel plate is adopted to be added into the bottom 1/4, the bottom carbon is added into the bottom 1/4, the metal Mo, the metal Cr, the metal NMn, the metal NCrFe and the metal VFe are placed at the middle upper part of the crucible, and the upper part is covered by the nickel plate; 0.05 percent of Ni-Mg alloy and 0.3kg of rare earth are added in each vacuum furnace for refining, and Al and Ti small materials are added for deoxidation when a film is formed after the refining is stopped, and the components are controlled;
(3) electroslag remelting: carrying out an electroslag remelting process on the electrode bar to obtain an electroslag steel ingot, wherein a slag system executes the conventional electroslag process, and the adopted slag system proportion is as follows: CaF 2: 65 percent; AL2O 3: 23.5 percent; CaO: 5 percent; MgO: 5 percent; TiO 2: 1.5 percent;
(4) forging: red transferring and charging an electroslag steel ingot into a furnace, forging and heating at the temperature of 1160-1180 ℃, wherein the heating rate in the heating process is not more than 300 ℃/h, the heat preservation time is not less than 40 minutes, the forging is performed after light forging and heavy forging, the furnace returns to heat at the temperature of 1180 ℃, the heat preservation time is 30 minutes, the forging specification is 48mm by 48mm square bar, air cooling is performed after forging, 100% of the square bar is subjected to flaw detection, and the surface is polished to remove defects;
(5) hot rolling: hot rolling the square rod to form a wire rod with the diameter of 8.0mm, heating to 1170-1200 ℃, preserving heat for 40 minutes, and air cooling;
(6) solution annealing treatment: preheating an electric furnace empty to 750 ℃, charging, keeping the annealing temperature at 1040-1080 ℃, keeping the temperature for 45 minutes, and cooling by water;
(7) drawing: firstly, acid cleaning to check the surface quality, grinding to remove crack defects, and then executing the existing production process to slowly draw the wire rod into filaments;
(8) coiling: the cleaning and drying surface is smooth and free of oil stain, burr, scratch, rust spot, oxide skin, pock mark, crack and dust accumulation, and the cleaning and cleaning layer is wound on the disc.
In addition, the vacuum smelting needs to be fully degassed, the refining control is enhanced, and the manganese nitride and the chromium nitride are added in the later period.
Moreover, the pickling wire rod must be carefully checked, production drawing is carried out after defects are removed through polishing, and the straight welding wire finished product is cleaned and dried.
The main elements in the present invention will be described in detail below, and the contents refer to the mass percentages of the respective elements in the alloy (wire).
C: by strictly controlling the content of C, the influence on the mechanical property, the oxidation resistance and the corrosion resistance of the welding wire due to the formation of carbide by C and Cr can be effectively avoided, and the intercrystalline corrosion can be effectively reduced due to the lower content of C. Therefore, the content of C in the alloy material of the invention is preferably less than 0.05-0.075%.
Si: the higher silicon content can increase the segregation degree and the inclusion content in the steel, a banded structure appears, the higher silicon content is not beneficial to drawing, the wear of a wire drawing die is aggravated, and the user cost is increased, so the invention adopts the lower silicon content, wherein the preferred silicon content is 0.45-0.6%.
Mn: mn can be dissolved into the Ni-Cr alloy in a large amount, can refine grains and improve the processing performance, is an effective element for strengthening a welding seam, and is a better S, O, C remover, and the content of the manganese is preferably 6.2-7.5%.
S, P: s, P is a harmful element, and the content of P is preferably less than 0.01%, and the content of S is preferably less than 0.01%.
Ni: the austenite stabilizing element of nickel has strong passivation effect, and can obviously improve the corrosion resistance by matching with chromium. The addition of nickel gives austenite a relatively low yield strength, a high tensile strength and good plasticity, in particular good low-temperature toughness.
Cr: cr is an element for improving the hardenability of steel, a strong carbide forming element is used together with Cu to improve the corrosion resistance of the steel, and Ni and Cr are added in a composite manner, so that the corrosion resistance of the steel is better. Moreover, a certain Cr content can ensure the formation of a passive film and ensure that deposited metal has certain corrosion performance, so the Cr content is preferably 18.5-19.5%.
Mo: the role of molybdenum in steel can be summarized as improving hardenability and heat strength, preventing temper brittleness, improving remanence and coercive force, improving corrosion resistance in certain media, preventing pitting tendency, and the like. Molybdenum has a beneficial effect in improving the ductility and toughness as well as the wear resistance of the steel. Therefore, the higher content of Mo prevents the generation of weld cracks during high-temperature welding, and the content of Mo is preferably 6.0-6.5%.
V: the low vanadium content is used for purifying and modifying and refining crystal grains, so that the alloying of the wear-resistant welding wire is facilitated, and the wear resistance is improved, so that the content of V is controlled to be 0.75-0.85%.
Ti: ti is a good deoxidizing and degassing agent and an effective element for fixing nitrogen and carbon. The content of the titanium element in the titanium alloy is controlled to be less than or equal to 0.03 percent.
N: nitrogen is an element that forms very strongly and expands the austenitic phase region, and suppresses carbide precipitation in austenitic stainless steels, which has a favorable effect on the sensitized intergranular corrosion and toughness of the steel. Since the solubility is affected by Cr and Mn, the content thereof should be controlled to 0.11-0.16%.
Cu: copper can improve strength and toughness, but is likely to cause hot shortness at the time of hot working, so that the content of copper is preferably 0.05% or less in the present invention.
Al: the aluminum is a strong deoxidizer and is mainly used for fully deoxidizing the final stage of refining, and the content is controlled to be less than or equal to 0.03 percent.
Fe: although Fe is the balance in the material of the invention, when the content of the iron element is more than a certain content, the purpose of increasing the iron content is to use cheap iron to replace expensive nickel and form a solid solution matrix with Ni, which has higher strength than that of a pure Ni matrix, so the design scheme of adopting high-iron nickel saving can reduce the cost of the material and ensure the high-temperature strength of the material.
The present invention will be further described with reference to the following specific examples.
Table 1 below shows the specific elemental composition and the weight percentage content of each component of the H0Cr19Ni24Mn7Mo6VN welding wire of five embodiments of the invention.
TABLE 1 elemental composition and weight percent content of each component of each example of the invention
Unit: weight percent (%)
Remarking: other components are required: o is less than or equal to 0.005As is less than or equal to 0.080, and the balance is Fe, which is not listed in Table 1.
The preparation method of the H0Cr19Ni24Mn7Mo6VN welding wire of each embodiment of the invention adopts the following steps:
(1) preparing materials: preparing materials according to the designed components, and strictly baking all materials according to the system; wherein, all metal materials are required to meet the quality standard, and the surface of the same steel grade is returned to be polished and the addition is less than or equal to 10 percent; the blending amount of each element is strictly controlled by the ingredients;
(2) vacuum smelting: adding small nickel plates into the bottom of about 1/4 percent, adding 0.020 percent of bottom carbon, placing Mo, Cr, NMn, NCrFe and VFe at the middle upper part of the crucible, and covering the upper part with a Ni plate; putting the raw materials into a vacuum furnace for smelting, performing according to a welding wire smelting process, wherein the vacuum degree in the melting period is less than 8 Pa, adding Ni-Mg0.05% and rare earth 0.3kg into a furnace for refining, adding Al and Ti small materials for deoxidation when a film is formed after refining is stopped, and controlling the components; the vacuum degree in the refining period is less than or equal to 5Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1560-1580 ℃/1-2 minutes, the steel temperature is lowered to 1480 ℃ and the refining time is more than or equal to 25min, the refining temperature is 1560 ℃, argon gas can not be filled in the whole process, the tapping temperature is 1540 ℃, 200Kg of electrode bar is cast, feeding is carried out in the later casting period, and the mold is removed after the casting is finished for 15 minutes;
(3) electroslag remelting: carrying out an electroslag remelting process on the electrode bar to obtain an electroslag steel ingot, wherein a slag system executes the conventional electroslag process, and the adopted slag system proportion is as follows: CaF 2: 65 percent; AL2O 3: 23.5 percent; CaO: 5 percent; MgO: 5 percent; TiO 2: 1.5 percent; the surface of the electrode is clean and free of impurities, and shrinkage cavities at two ends are cut and cleaned;
(4) forging: red transferring and charging an electroslag steel ingot into a furnace, forging and heating at the temperature of 1160-1180 ℃, wherein the heating rate in the heating process is not more than 300 ℃/h, the heat preservation time is not less than 40 minutes, the forging is performed after light forging and heavy forging, the furnace returns to heat at the temperature of 1180 ℃, the heat preservation time is 30 minutes, the forging specification is 48mm by 48mm square bar, air cooling is performed after forging, 100% of the square bar is subjected to flaw detection, and the surface is polished to remove defects;
(5) hot rolling: hot rolling the square rod to form a wire rod with the diameter of 8.0mm, heating to 1170-1200 ℃, preserving heat for 40 minutes, and air cooling;
(6) solution annealing treatment: preheating an electric furnace empty to 750 ℃, charging, keeping the annealing temperature at 1040-1080 ℃, keeping the temperature for 45 minutes, and cooling by water;
(7) drawing: firstly, acid cleaning is carried out to check the surface quality, the crack defect is removed by grinding, and then the existing production process is executed to draw the wire rod into the wire rod at a low speed
A filament;
(8) coiling: the cleaned and dried surface is smooth and free of oil stain, burr, scratch, rust spot, oxide skin, pock mark, crack and dust deposition defects, and the cleaned and clean layer is wound on a disc, wherein the number of the cleaned and dried layer is 1200 kg.
Through detection, the finished welding wire products produced by the embodiments 1-5 have the tensile strength Rm of 1100-1400MPa, have no defects of oil stain, oxide, dust and the like, and have bright surfaces.
Further, a block sample having a size of 10cm by 5cm was deposited on the substrate by TIG welding using the finished welding wire produced in examples 1 to 5 described above. And (3) placing the welded sample in a 6% FeCl3+0.05mol/L HCl solution for soaking for one month, observing the surface appearance, and finding that the surface has no corrosion in any form and meets the requirement of corrosion resistance.
Therefore, from the above, the H0Cr19Ni24Mn7Mo6VN welding wire produced by the preparation method has good mechanical property and corrosion resistance, has excellent comprehensive performance, and can be completely suitable for severe corrosion environments with high requirements on corrosion resistance.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. Furthermore, the technical features mentioned in the different embodiments of the present invention described above may be combined with each other as long as they do not conflict with each other. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. The welding wire is characterized in that the welding wire comprises the following elements in percentage by weight: 0.05 to 0.075 percent of C, 0.45 to 0.6 percent of Si, 6.2 to 7.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 18.5 to 19.5 percent of Cr, 23.0 to 24.0 percent of Ni, 6.0 to 6.5 percent of Mo, 0.75 to 0.85 percent of V, 0.11 to 0.16 percent of N, less than or equal to 0.03 percent of Ti, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Al, less than or equal to 0.005As, less than or equal to 0.080 percent of As, and the balance of Fe.
2. The H0Cr19Ni24Mn7Mo6VN welding wire of claim 1, wherein the mechanical properties of the welding wire are satisfied: the tensile strength Rm is 1100-1400 MPa.
3. A method of producing the H0Cr19Ni24Mn7Mo6VN welding wire of claim 1 or 2, wherein the method of producing comprises:
(1) preparing materials: preparing materials according to the designed components, and strictly baking all materials according to the system;
(2) vacuum smelting: putting the raw materials into a vacuum furnace for smelting, and performing according to a welding wire smelting process, wherein the vacuum degree in a melting period is less than 8 Pa, the vacuum degree in a refining period is less than or equal to 5Pa, performing high-temperature instantaneous refining at least twice and low-temperature long-time refining at one time, raising the steel temperature to 1560-1580 ℃/1-2 minutes, reducing the steel temperature to 1480 ℃, enabling the refining time to be more than or equal to 25 minutes, enabling the refining temperature to 1560 ℃, not charging argon in the whole process, tapping at 1540 ℃, and casting into 200Kg of electrode bars;
(3) electroslag remelting: carrying out an electroslag remelting process on the electrode bar to obtain an electroslag steel ingot, wherein the slag system executes the existing electroslag process;
(4) forging: red transferring and charging an electroslag steel ingot, forging and heating at 1160-1180 ℃, wherein the heating rate in the heating process is less than or equal to 300 ℃/h, the heat preservation time is more than or equal to 40 minutes, the forging specification is 48mm by 48mm square bars, air cooling is carried out after forging, 100% flaw detection is carried out on the square bars, and the defects are removed by grinding the surfaces;
(5) hot rolling: hot rolling the square rod to form a wire rod with the diameter of 8.0mm, heating to 1170-1200 ℃, preserving heat for 40 minutes, and air cooling;
(6) solution annealing treatment: preheating an electric furnace empty to 750 ℃, charging, keeping the annealing temperature at 1040-1080 ℃, keeping the temperature for 45 minutes, and cooling by water;
(7) drawing: firstly, acid cleaning to check the surface quality, grinding to remove crack defects, and then executing the existing production process to slowly draw the wire rod into filaments;
(8) coiling: the cleaning and drying surface is smooth and free of oil stain, burr, scratch, rust spot, oxide skin, pock mark, crack and dust accumulation, and the cleaning and cleaning layer is wound on the disc.
4. The method for preparing H0Cr19Ni24Mn7Mo6VN welding wire according to claim 3, wherein in step (2), the bottom 1/4 is added using a small nickel plate, the bottom carbon is added in 0.02%, the metal Mo, the metal Cr, NMn, NCrFe, VFe are placed in the crucible at the upper part, and the upper part is covered with the nickel plate in the vacuum furnace.
5. The method for preparing the welding wire of H0Cr19Ni24Mn7Mo6VN as claimed in claim 3, wherein in step (2), 0.05% of Ni-Mg alloy and 0.3kg of rare earth are added for each vacuum furnace refining, and Al and Ti small materials are added for deoxidation and component control during film blackout after refining.
6. The method for preparing the H0Cr19Ni24Mn7Mo6VN welding wire according to claim 3, wherein in the step (3), the slag system mixture ratio is CaF 2: 65 percent; AL2O3：23.5%；CaO：5%；MgO：5%；TiO2：1.5%。
7. The method for preparing the H0Cr19Ni24Mn7Mo6VN welding wire as claimed in claim 3, wherein in the step (1), the surface of the returned steel is polished to less than or equal to 10%.
8. The method for preparing the H0Cr19Ni24Mn7Mo6VN welding wire as claimed in claim 3, wherein in step (4), the welding wire is forged after being forged by light forging and then being forged again after being heated in a furnace to 1180 ℃ for 30 min.
9. The method for preparing the H0Cr19Ni24Mn7Mo6VN welding wire as claimed in claim 3, wherein in step (2), feeding is performed at the later stage of casting, and the mold mark is broken after the casting is completed for 15 minutes.
10. The method for preparing the H0Cr19Ni24Mn7Mo6VN welding wire as claimed in claim 3, wherein in step (2), vacuum smelting is performed to fully degas, and manganese nitride and chromium nitride are added at a later stage.
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